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3dd681d9 WD |
1 | /* |
2 | * Based on arch/arm/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1995-2009 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * Modified by Will Deacon <will.deacon@arm.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #define __SYSCALL_COMPAT | |
22 | ||
23 | #include <linux/compat.h> | |
24 | #include <linux/signal.h> | |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/ratelimit.h> | |
27 | ||
28 | #include <asm/fpsimd.h> | |
29 | #include <asm/signal32.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/unistd.h> | |
32 | ||
3dd681d9 WD |
33 | struct compat_sigaction { |
34 | compat_uptr_t sa_handler; | |
35 | compat_ulong_t sa_flags; | |
36 | compat_uptr_t sa_restorer; | |
37 | compat_sigset_t sa_mask; | |
38 | }; | |
39 | ||
40 | struct compat_old_sigaction { | |
41 | compat_uptr_t sa_handler; | |
42 | compat_old_sigset_t sa_mask; | |
43 | compat_ulong_t sa_flags; | |
44 | compat_uptr_t sa_restorer; | |
45 | }; | |
46 | ||
47 | typedef struct compat_sigaltstack { | |
48 | compat_uptr_t ss_sp; | |
49 | int ss_flags; | |
50 | compat_size_t ss_size; | |
51 | } compat_stack_t; | |
52 | ||
53 | struct compat_sigcontext { | |
54 | /* We always set these two fields to 0 */ | |
55 | compat_ulong_t trap_no; | |
56 | compat_ulong_t error_code; | |
57 | ||
58 | compat_ulong_t oldmask; | |
59 | compat_ulong_t arm_r0; | |
60 | compat_ulong_t arm_r1; | |
61 | compat_ulong_t arm_r2; | |
62 | compat_ulong_t arm_r3; | |
63 | compat_ulong_t arm_r4; | |
64 | compat_ulong_t arm_r5; | |
65 | compat_ulong_t arm_r6; | |
66 | compat_ulong_t arm_r7; | |
67 | compat_ulong_t arm_r8; | |
68 | compat_ulong_t arm_r9; | |
69 | compat_ulong_t arm_r10; | |
70 | compat_ulong_t arm_fp; | |
71 | compat_ulong_t arm_ip; | |
72 | compat_ulong_t arm_sp; | |
73 | compat_ulong_t arm_lr; | |
74 | compat_ulong_t arm_pc; | |
75 | compat_ulong_t arm_cpsr; | |
76 | compat_ulong_t fault_address; | |
77 | }; | |
78 | ||
79 | struct compat_ucontext { | |
80 | compat_ulong_t uc_flags; | |
81 | struct compat_ucontext *uc_link; | |
82 | compat_stack_t uc_stack; | |
83 | struct compat_sigcontext uc_mcontext; | |
84 | compat_sigset_t uc_sigmask; | |
85 | int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))]; | |
86 | compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8))); | |
87 | }; | |
88 | ||
89 | struct compat_vfp_sigframe { | |
90 | compat_ulong_t magic; | |
91 | compat_ulong_t size; | |
92 | struct compat_user_vfp { | |
93 | compat_u64 fpregs[32]; | |
94 | compat_ulong_t fpscr; | |
95 | } ufp; | |
96 | struct compat_user_vfp_exc { | |
97 | compat_ulong_t fpexc; | |
98 | compat_ulong_t fpinst; | |
99 | compat_ulong_t fpinst2; | |
100 | } ufp_exc; | |
101 | } __attribute__((__aligned__(8))); | |
102 | ||
103 | #define VFP_MAGIC 0x56465001 | |
104 | #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe) | |
105 | ||
106 | struct compat_aux_sigframe { | |
107 | struct compat_vfp_sigframe vfp; | |
108 | ||
109 | /* Something that isn't a valid magic number for any coprocessor. */ | |
110 | unsigned long end_magic; | |
111 | } __attribute__((__aligned__(8))); | |
112 | ||
113 | struct compat_sigframe { | |
114 | struct compat_ucontext uc; | |
115 | compat_ulong_t retcode[2]; | |
116 | }; | |
117 | ||
118 | struct compat_rt_sigframe { | |
119 | struct compat_siginfo info; | |
120 | struct compat_sigframe sig; | |
121 | }; | |
122 | ||
123 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
124 | ||
125 | /* | |
126 | * For ARM syscalls, the syscall number has to be loaded into r7. | |
127 | * We do not support an OABI userspace. | |
128 | */ | |
129 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_sigreturn) | |
130 | #define SVC_SYS_SIGRETURN (0xef000000 | __NR_sigreturn) | |
131 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_rt_sigreturn) | |
132 | #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_rt_sigreturn) | |
133 | ||
134 | /* | |
135 | * For Thumb syscalls, we also pass the syscall number via r7. We therefore | |
136 | * need two 16-bit instructions. | |
137 | */ | |
138 | #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_sigreturn) << 16) | \ | |
139 | 0x2700 | __NR_sigreturn) | |
140 | #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_rt_sigreturn) << 16) | \ | |
141 | 0x2700 | __NR_rt_sigreturn) | |
142 | ||
143 | const compat_ulong_t aarch32_sigret_code[6] = { | |
144 | /* | |
145 | * AArch32 sigreturn code. | |
146 | * We don't construct an OABI SWI - instead we just set the imm24 field | |
147 | * to the EABI syscall number so that we create a sane disassembly. | |
148 | */ | |
149 | MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN, | |
150 | MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN, | |
151 | }; | |
152 | ||
153 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
154 | { | |
155 | compat_sigset_t cset; | |
156 | ||
157 | cset.sig[0] = set->sig[0] & 0xffffffffull; | |
158 | cset.sig[1] = set->sig[0] >> 32; | |
159 | ||
160 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
161 | } | |
162 | ||
163 | static inline int get_sigset_t(sigset_t *set, | |
164 | const compat_sigset_t __user *uset) | |
165 | { | |
166 | compat_sigset_t s32; | |
167 | ||
168 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
169 | return -EFAULT; | |
170 | ||
171 | set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
176 | { | |
177 | int err; | |
178 | ||
179 | if (!access_ok(VERIFY_WRITE, to, sizeof(*to))) | |
180 | return -EFAULT; | |
181 | ||
182 | /* If you change siginfo_t structure, please be sure | |
183 | * this code is fixed accordingly. | |
184 | * It should never copy any pad contained in the structure | |
185 | * to avoid security leaks, but must copy the generic | |
186 | * 3 ints plus the relevant union member. | |
187 | * This routine must convert siginfo from 64bit to 32bit as well | |
188 | * at the same time. | |
189 | */ | |
190 | err = __put_user(from->si_signo, &to->si_signo); | |
191 | err |= __put_user(from->si_errno, &to->si_errno); | |
192 | err |= __put_user((short)from->si_code, &to->si_code); | |
193 | if (from->si_code < 0) | |
194 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, | |
195 | SI_PAD_SIZE); | |
196 | else switch (from->si_code & __SI_MASK) { | |
197 | case __SI_KILL: | |
198 | err |= __put_user(from->si_pid, &to->si_pid); | |
199 | err |= __put_user(from->si_uid, &to->si_uid); | |
200 | break; | |
201 | case __SI_TIMER: | |
202 | err |= __put_user(from->si_tid, &to->si_tid); | |
203 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
204 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, | |
205 | &to->si_ptr); | |
206 | break; | |
207 | case __SI_POLL: | |
208 | err |= __put_user(from->si_band, &to->si_band); | |
209 | err |= __put_user(from->si_fd, &to->si_fd); | |
210 | break; | |
211 | case __SI_FAULT: | |
212 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr, | |
213 | &to->si_addr); | |
214 | #ifdef BUS_MCEERR_AO | |
215 | /* | |
216 | * Other callers might not initialize the si_lsb field, | |
217 | * so check explicitely for the right codes here. | |
218 | */ | |
219 | if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO) | |
220 | err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); | |
221 | #endif | |
222 | break; | |
223 | case __SI_CHLD: | |
224 | err |= __put_user(from->si_pid, &to->si_pid); | |
225 | err |= __put_user(from->si_uid, &to->si_uid); | |
226 | err |= __put_user(from->si_status, &to->si_status); | |
227 | err |= __put_user(from->si_utime, &to->si_utime); | |
228 | err |= __put_user(from->si_stime, &to->si_stime); | |
229 | break; | |
230 | case __SI_RT: /* This is not generated by the kernel as of now. */ | |
231 | case __SI_MESGQ: /* But this is */ | |
232 | err |= __put_user(from->si_pid, &to->si_pid); | |
233 | err |= __put_user(from->si_uid, &to->si_uid); | |
234 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr); | |
235 | break; | |
236 | default: /* this is just in case for now ... */ | |
237 | err |= __put_user(from->si_pid, &to->si_pid); | |
238 | err |= __put_user(from->si_uid, &to->si_uid); | |
239 | break; | |
240 | } | |
241 | return err; | |
242 | } | |
243 | ||
244 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
245 | { | |
246 | memset(to, 0, sizeof *to); | |
247 | ||
248 | if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) || | |
249 | copy_from_user(to->_sifields._pad, | |
250 | from->_sifields._pad, SI_PAD_SIZE)) | |
251 | return -EFAULT; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | /* | |
257 | * VFP save/restore code. | |
258 | */ | |
259 | static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame) | |
260 | { | |
261 | struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state; | |
262 | compat_ulong_t magic = VFP_MAGIC; | |
263 | compat_ulong_t size = VFP_STORAGE_SIZE; | |
264 | compat_ulong_t fpscr, fpexc; | |
265 | int err = 0; | |
266 | ||
267 | /* | |
268 | * Save the hardware registers to the fpsimd_state structure. | |
269 | * Note that this also saves V16-31, which aren't visible | |
270 | * in AArch32. | |
271 | */ | |
272 | fpsimd_save_state(fpsimd); | |
273 | ||
274 | /* Place structure header on the stack */ | |
275 | __put_user_error(magic, &frame->magic, err); | |
276 | __put_user_error(size, &frame->size, err); | |
277 | ||
278 | /* | |
279 | * Now copy the FP registers. Since the registers are packed, | |
280 | * we can copy the prefix we want (V0-V15) as it is. | |
281 | * FIXME: Won't work if big endian. | |
282 | */ | |
283 | err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs, | |
284 | sizeof(frame->ufp.fpregs)); | |
285 | ||
286 | /* Create an AArch32 fpscr from the fpsr and the fpcr. */ | |
287 | fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) | | |
288 | (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK); | |
289 | __put_user_error(fpscr, &frame->ufp.fpscr, err); | |
290 | ||
291 | /* | |
292 | * The exception register aren't available so we fake up a | |
293 | * basic FPEXC and zero everything else. | |
294 | */ | |
295 | fpexc = (1 << 30); | |
296 | __put_user_error(fpexc, &frame->ufp_exc.fpexc, err); | |
297 | __put_user_error(0, &frame->ufp_exc.fpinst, err); | |
298 | __put_user_error(0, &frame->ufp_exc.fpinst2, err); | |
299 | ||
300 | return err ? -EFAULT : 0; | |
301 | } | |
302 | ||
303 | static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame) | |
304 | { | |
305 | struct fpsimd_state fpsimd; | |
306 | compat_ulong_t magic = VFP_MAGIC; | |
307 | compat_ulong_t size = VFP_STORAGE_SIZE; | |
308 | compat_ulong_t fpscr; | |
309 | int err = 0; | |
310 | ||
311 | __get_user_error(magic, &frame->magic, err); | |
312 | __get_user_error(size, &frame->size, err); | |
313 | ||
314 | if (err) | |
315 | return -EFAULT; | |
316 | if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) | |
317 | return -EINVAL; | |
318 | ||
319 | /* | |
320 | * Copy the FP registers into the start of the fpsimd_state. | |
321 | * FIXME: Won't work if big endian. | |
322 | */ | |
323 | err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs, | |
324 | sizeof(frame->ufp.fpregs)); | |
325 | ||
326 | /* Extract the fpsr and the fpcr from the fpscr */ | |
327 | __get_user_error(fpscr, &frame->ufp.fpscr, err); | |
328 | fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK; | |
329 | fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK; | |
330 | ||
331 | /* | |
332 | * We don't need to touch the exception register, so | |
333 | * reload the hardware state. | |
334 | */ | |
335 | if (!err) { | |
336 | preempt_disable(); | |
337 | fpsimd_load_state(&fpsimd); | |
338 | preempt_enable(); | |
339 | } | |
340 | ||
341 | return err ? -EFAULT : 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * atomically swap in the new signal mask, and wait for a signal. | |
346 | */ | |
347 | asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask, | |
348 | compat_old_sigset_t mask) | |
349 | { | |
350 | sigset_t blocked; | |
351 | ||
352 | siginitset(¤t->blocked, mask); | |
353 | return sigsuspend(&blocked); | |
354 | } | |
355 | ||
356 | asmlinkage int compat_sys_sigaction(int sig, | |
357 | const struct compat_old_sigaction __user *act, | |
358 | struct compat_old_sigaction __user *oact) | |
359 | { | |
360 | struct k_sigaction new_ka, old_ka; | |
361 | int ret; | |
362 | compat_old_sigset_t mask; | |
363 | compat_uptr_t handler, restorer; | |
364 | ||
365 | if (act) { | |
366 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
367 | __get_user(handler, &act->sa_handler) || | |
368 | __get_user(restorer, &act->sa_restorer) || | |
369 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
370 | __get_user(mask, &act->sa_mask)) | |
371 | return -EFAULT; | |
372 | ||
373 | new_ka.sa.sa_handler = compat_ptr(handler); | |
374 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
375 | siginitset(&new_ka.sa.sa_mask, mask); | |
376 | } | |
377 | ||
378 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
379 | ||
380 | if (!ret && oact) { | |
381 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
382 | __put_user(ptr_to_compat(old_ka.sa.sa_handler), | |
383 | &oact->sa_handler) || | |
384 | __put_user(ptr_to_compat(old_ka.sa.sa_restorer), | |
385 | &oact->sa_restorer) || | |
386 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
387 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
388 | return -EFAULT; | |
389 | } | |
390 | ||
391 | return ret; | |
392 | } | |
393 | ||
394 | asmlinkage int compat_sys_rt_sigaction(int sig, | |
395 | const struct compat_sigaction __user *act, | |
396 | struct compat_sigaction __user *oact, | |
397 | compat_size_t sigsetsize) | |
398 | { | |
399 | struct k_sigaction new_ka, old_ka; | |
400 | int ret; | |
401 | ||
402 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
403 | if (sigsetsize != sizeof(compat_sigset_t)) | |
404 | return -EINVAL; | |
405 | ||
406 | if (act) { | |
407 | compat_uptr_t handler, restorer; | |
408 | ||
409 | ret = get_user(handler, &act->sa_handler); | |
410 | new_ka.sa.sa_handler = compat_ptr(handler); | |
411 | ret |= get_user(restorer, &act->sa_restorer); | |
412 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
413 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); | |
414 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
415 | if (ret) | |
416 | return -EFAULT; | |
417 | } | |
418 | ||
419 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
420 | if (!ret && oact) { | |
421 | ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler); | |
422 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); | |
423 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
424 | } | |
425 | return ret; | |
426 | } | |
427 | ||
428 | int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss, | |
429 | compat_ulong_t sp) | |
430 | { | |
431 | compat_stack_t __user *newstack = compat_ptr(compat_uss); | |
432 | compat_stack_t __user *oldstack = compat_ptr(compat_uoss); | |
433 | compat_uptr_t ss_sp; | |
434 | int ret; | |
435 | mm_segment_t old_fs; | |
436 | stack_t uss, uoss; | |
437 | ||
438 | /* Marshall the compat new stack into a stack_t */ | |
439 | if (newstack) { | |
440 | if (get_user(ss_sp, &newstack->ss_sp) || | |
441 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
442 | __get_user(uss.ss_size, &newstack->ss_size)) | |
443 | return -EFAULT; | |
444 | uss.ss_sp = compat_ptr(ss_sp); | |
445 | } | |
446 | ||
447 | old_fs = get_fs(); | |
448 | set_fs(KERNEL_DS); | |
449 | /* The __user pointer casts are valid because of the set_fs() */ | |
450 | ret = do_sigaltstack( | |
451 | newstack ? (stack_t __user *) &uss : NULL, | |
452 | oldstack ? (stack_t __user *) &uoss : NULL, | |
453 | (unsigned long)sp); | |
454 | set_fs(old_fs); | |
455 | ||
456 | /* Convert the old stack_t into a compat stack. */ | |
457 | if (!ret && oldstack && | |
458 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || | |
459 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || | |
460 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
461 | return -EFAULT; | |
462 | return ret; | |
463 | } | |
464 | ||
465 | static int compat_restore_sigframe(struct pt_regs *regs, | |
466 | struct compat_sigframe __user *sf) | |
467 | { | |
468 | int err; | |
469 | sigset_t set; | |
470 | struct compat_aux_sigframe __user *aux; | |
471 | ||
472 | err = get_sigset_t(&set, &sf->uc.uc_sigmask); | |
473 | if (err == 0) { | |
474 | sigdelsetmask(&set, ~_BLOCKABLE); | |
475 | set_current_blocked(&set); | |
476 | } | |
477 | ||
478 | __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); | |
479 | __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); | |
480 | __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); | |
481 | __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); | |
482 | __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); | |
483 | __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); | |
484 | __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); | |
485 | __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); | |
486 | __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); | |
487 | __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); | |
488 | __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); | |
489 | __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); | |
490 | __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); | |
491 | __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
492 | __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
493 | __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); | |
494 | __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); | |
495 | ||
496 | /* | |
497 | * Avoid compat_sys_sigreturn() restarting. | |
498 | */ | |
499 | regs->syscallno = ~0UL; | |
500 | ||
501 | err |= !valid_user_regs(®s->user_regs); | |
502 | ||
503 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; | |
504 | if (err == 0) | |
505 | err |= compat_restore_vfp_context(&aux->vfp); | |
506 | ||
507 | return err; | |
508 | } | |
509 | ||
510 | asmlinkage int compat_sys_sigreturn(struct pt_regs *regs) | |
511 | { | |
512 | struct compat_sigframe __user *frame; | |
513 | ||
514 | /* Always make any pending restarted system calls return -EINTR */ | |
515 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
516 | ||
517 | /* | |
518 | * Since we stacked the signal on a 64-bit boundary, | |
519 | * then 'sp' should be word aligned here. If it's | |
520 | * not, then the user is trying to mess with us. | |
521 | */ | |
522 | if (regs->compat_sp & 7) | |
523 | goto badframe; | |
524 | ||
525 | frame = (struct compat_sigframe __user *)regs->compat_sp; | |
526 | ||
527 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
528 | goto badframe; | |
529 | ||
530 | if (compat_restore_sigframe(regs, frame)) | |
531 | goto badframe; | |
532 | ||
533 | return regs->regs[0]; | |
534 | ||
535 | badframe: | |
536 | if (show_unhandled_signals) | |
537 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", | |
538 | current->comm, task_pid_nr(current), __func__, | |
539 | regs->pc, regs->sp); | |
540 | force_sig(SIGSEGV, current); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs) | |
545 | { | |
546 | struct compat_rt_sigframe __user *frame; | |
547 | ||
548 | /* Always make any pending restarted system calls return -EINTR */ | |
549 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
550 | ||
551 | /* | |
552 | * Since we stacked the signal on a 64-bit boundary, | |
553 | * then 'sp' should be word aligned here. If it's | |
554 | * not, then the user is trying to mess with us. | |
555 | */ | |
556 | if (regs->compat_sp & 7) | |
557 | goto badframe; | |
558 | ||
559 | frame = (struct compat_rt_sigframe __user *)regs->compat_sp; | |
560 | ||
561 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
562 | goto badframe; | |
563 | ||
564 | if (compat_restore_sigframe(regs, &frame->sig)) | |
565 | goto badframe; | |
566 | ||
567 | if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack), | |
568 | ptr_to_compat((void __user *)NULL), | |
569 | regs->compat_sp) == -EFAULT) | |
570 | goto badframe; | |
571 | ||
572 | return regs->regs[0]; | |
573 | ||
574 | badframe: | |
575 | if (show_unhandled_signals) | |
576 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", | |
577 | current->comm, task_pid_nr(current), __func__, | |
578 | regs->pc, regs->sp); | |
579 | force_sig(SIGSEGV, current); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static inline void __user *compat_get_sigframe(struct k_sigaction *ka, | |
584 | struct pt_regs *regs, | |
585 | int framesize) | |
586 | { | |
587 | compat_ulong_t sp = regs->compat_sp; | |
588 | void __user *frame; | |
589 | ||
590 | /* | |
591 | * This is the X/Open sanctioned signal stack switching. | |
592 | */ | |
593 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) | |
594 | sp = current->sas_ss_sp + current->sas_ss_size; | |
595 | ||
596 | /* | |
597 | * ATPCS B01 mandates 8-byte alignment | |
598 | */ | |
599 | frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7)); | |
600 | ||
601 | /* | |
602 | * Check that we can actually write to the signal frame. | |
603 | */ | |
604 | if (!access_ok(VERIFY_WRITE, frame, framesize)) | |
605 | frame = NULL; | |
606 | ||
607 | return frame; | |
608 | } | |
609 | ||
610 | static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, | |
611 | compat_ulong_t __user *rc, void __user *frame, | |
612 | int usig) | |
613 | { | |
614 | compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler); | |
615 | compat_ulong_t retcode; | |
616 | compat_ulong_t spsr = regs->pstate & ~PSR_f; | |
617 | int thumb; | |
618 | ||
619 | /* Check if the handler is written for ARM or Thumb */ | |
620 | thumb = handler & 1; | |
621 | ||
622 | if (thumb) { | |
623 | spsr |= COMPAT_PSR_T_BIT; | |
624 | spsr &= ~COMPAT_PSR_IT_MASK; | |
625 | } else { | |
626 | spsr &= ~COMPAT_PSR_T_BIT; | |
627 | } | |
628 | ||
629 | if (ka->sa.sa_flags & SA_RESTORER) { | |
630 | retcode = ptr_to_compat(ka->sa.sa_restorer); | |
631 | } else { | |
632 | /* Set up sigreturn pointer */ | |
633 | unsigned int idx = thumb << 1; | |
634 | ||
635 | if (ka->sa.sa_flags & SA_SIGINFO) | |
636 | idx += 3; | |
637 | ||
638 | retcode = AARCH32_VECTORS_BASE + | |
639 | AARCH32_KERN_SIGRET_CODE_OFFSET + | |
640 | (idx << 2) + thumb; | |
641 | } | |
642 | ||
643 | regs->regs[0] = usig; | |
644 | regs->compat_sp = ptr_to_compat(frame); | |
645 | regs->compat_lr = retcode; | |
646 | regs->pc = handler; | |
647 | regs->pstate = spsr; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | static int compat_setup_sigframe(struct compat_sigframe __user *sf, | |
653 | struct pt_regs *regs, sigset_t *set) | |
654 | { | |
655 | struct compat_aux_sigframe __user *aux; | |
656 | int err = 0; | |
657 | ||
658 | __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); | |
659 | __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); | |
660 | __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); | |
661 | __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); | |
662 | __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); | |
663 | __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); | |
664 | __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); | |
665 | __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); | |
666 | __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); | |
667 | __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); | |
668 | __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); | |
669 | __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); | |
670 | __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); | |
671 | __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); | |
672 | __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); | |
673 | __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); | |
674 | __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); | |
675 | ||
676 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); | |
677 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err); | |
678 | __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err); | |
679 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); | |
680 | ||
681 | err |= put_sigset_t(&sf->uc.uc_sigmask, set); | |
682 | ||
683 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; | |
684 | ||
685 | if (err == 0) | |
686 | err |= compat_preserve_vfp_context(&aux->vfp); | |
687 | __put_user_error(0, &aux->end_magic, err); | |
688 | ||
689 | return err; | |
690 | } | |
691 | ||
692 | /* | |
693 | * 32-bit signal handling routines called from signal.c | |
694 | */ | |
695 | int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, | |
696 | sigset_t *set, struct pt_regs *regs) | |
697 | { | |
698 | struct compat_rt_sigframe __user *frame; | |
699 | compat_stack_t stack; | |
700 | int err = 0; | |
701 | ||
702 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); | |
703 | ||
704 | if (!frame) | |
705 | return 1; | |
706 | ||
707 | err |= copy_siginfo_to_user32(&frame->info, info); | |
708 | ||
709 | __put_user_error(0, &frame->sig.uc.uc_flags, err); | |
710 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); | |
711 | ||
712 | memset(&stack, 0, sizeof(stack)); | |
713 | stack.ss_sp = (compat_uptr_t)current->sas_ss_sp; | |
714 | stack.ss_flags = sas_ss_flags(regs->compat_sp); | |
715 | stack.ss_size = current->sas_ss_size; | |
716 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); | |
717 | ||
718 | err |= compat_setup_sigframe(&frame->sig, regs, set); | |
719 | if (err == 0) | |
720 | err = compat_setup_return(regs, ka, frame->sig.retcode, frame, | |
721 | usig); | |
722 | ||
723 | if (err == 0) { | |
724 | regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info; | |
725 | regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc; | |
726 | } | |
727 | ||
728 | return err; | |
729 | } | |
730 | ||
731 | int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, | |
732 | struct pt_regs *regs) | |
733 | { | |
734 | struct compat_sigframe __user *frame; | |
735 | int err = 0; | |
736 | ||
737 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); | |
738 | ||
739 | if (!frame) | |
740 | return 1; | |
741 | ||
742 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); | |
743 | ||
744 | err |= compat_setup_sigframe(frame, regs, set); | |
745 | if (err == 0) | |
746 | err = compat_setup_return(regs, ka, frame->retcode, frame, usig); | |
747 | ||
748 | return err; | |
749 | } | |
750 | ||
751 | /* | |
752 | * RT signals don't have generic compat wrappers. | |
753 | * See arch/powerpc/kernel/signal_32.c | |
754 | */ | |
755 | asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, | |
756 | compat_sigset_t __user *oset, | |
757 | compat_size_t sigsetsize) | |
758 | { | |
759 | sigset_t s; | |
760 | sigset_t __user *up; | |
761 | int ret; | |
762 | mm_segment_t old_fs = get_fs(); | |
763 | ||
764 | if (set) { | |
765 | if (get_sigset_t(&s, set)) | |
766 | return -EFAULT; | |
767 | } | |
768 | ||
769 | set_fs(KERNEL_DS); | |
770 | /* This is valid because of the set_fs() */ | |
771 | up = (sigset_t __user *) &s; | |
772 | ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL, | |
773 | sigsetsize); | |
774 | set_fs(old_fs); | |
775 | if (ret) | |
776 | return ret; | |
777 | if (oset) { | |
778 | if (put_sigset_t(oset, &s)) | |
779 | return -EFAULT; | |
780 | } | |
781 | return 0; | |
782 | } | |
783 | ||
784 | asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set, | |
785 | compat_size_t sigsetsize) | |
786 | { | |
787 | sigset_t s; | |
788 | int ret; | |
789 | mm_segment_t old_fs = get_fs(); | |
790 | ||
791 | set_fs(KERNEL_DS); | |
792 | /* The __user pointer cast is valid because of the set_fs() */ | |
793 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
794 | set_fs(old_fs); | |
795 | if (!ret) { | |
796 | if (put_sigset_t(set, &s)) | |
797 | return -EFAULT; | |
798 | } | |
799 | return ret; | |
800 | } | |
801 | ||
802 | asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig, | |
803 | compat_siginfo_t __user *uinfo) | |
804 | { | |
805 | siginfo_t info; | |
806 | int ret; | |
807 | mm_segment_t old_fs = get_fs(); | |
808 | ||
809 | ret = copy_siginfo_from_user32(&info, uinfo); | |
810 | if (unlikely(ret)) | |
811 | return ret; | |
812 | ||
813 | set_fs (KERNEL_DS); | |
814 | /* The __user pointer cast is valid because of the set_fs() */ | |
815 | ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info); | |
816 | set_fs (old_fs); | |
817 | return ret; | |
818 | } | |
819 | ||
820 | void compat_setup_restart_syscall(struct pt_regs *regs) | |
821 | { | |
822 | regs->regs[7] = __NR_restart_syscall; | |
823 | } |